GAI-Tronics 495-001 Mine Dial / Page Phone Interface Cabinet - Manual

Pub. 42004-198D
GAI-Tronics Corporation 400 E. Wyomissing Ave. Mohnton, PA 19540 USA
610-777-1374 „ 800-492-1212 „ Fax: 610-796-5954
V ISIT WWW . GAI - TRONICS . COM FOR PRODUCT LITERATURE AND MANUALS
G A I - T R O N I C S ® C O R P O R A T I O N
A H U B B E L L C O M P A N Y
Model 495-001 Mine Dial/Page
Phone Interface Cabinet
Confidentiality Notice
This manual is provided solely as an operational, installation, and maintenance guide and contains
sensitive business and technical information that is confidential and proprietary to GAI-Tronics.
GAI-Tronics retains all intellectual property and other rights in or to the information contained herein,
and such information may only be used in connection with the operation of your GAI-Tronics product or
system. This manual may not be disclosed in any form, in whole or in part, directly or indirectly, to any
third party.
General Information
The GAI-Tronics Mine Dial/Page Phone system provides the convenience of a telephone station plus
additional paging capabilities in gaseous or dusty locations too hazardous for standard telephone
equipment.
The system is used in conjunction with Touch Tone (DTMF) operated public telephone exchange or a
private branch exchange (PABX). Each station in the system is made up of two components: a 491
Series Mine Dial/Page Phone, and a Model 495-001 Mine Dial/Page Phone Interface Cabinet located
outside the hazardous area. The Model 495-001 Interface Cabinet is electrically connected between the
station and the telephone switchboard. Each station is connected to a separate line of the telephone
exchange. A simplified diagram for a Mine Dial/Page Phone system is shown in Figure 1.
A person at any properly installed GAI-Tronics 491 Series Mine Dial/Page Phone station can dial any
other such station or any other conventional telephone connected to that switchboard. If the switchboard
is tied into the public telephone system, calls can be made to, and received from any public telephone.
In keeping with MSHA regulations, at least one GAI-Tronics 491 Series Mine Dial/Page Phone station
for each interface cabinet must be installed on the outside of a coal mine.
Principles of Operation
Each 491 Series Mine Dial/Page Phone is normally connected by an individual pair of wires to the Model
495-001 Interface Cabinet, but up to five phones can be connected in parallel. (N
OTE : This system is
designed to operate with only one station off hook). Outgoing calls can be made from any station and
answered at any station - the same as when extension telephones are used. It is not possible to dial calls
between stations on the same line.